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Sample 1-62
NavDat sample number 4731 · RHYOLITE
Sample
| Sample ID | 1-62 |
|---|
| Rock name | RHYOLITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | a few plagioclase phenocrysts in an aphanitic groundmass; groundmass is extremely fine and primarily composed of orthoclase and quartz; pyroxenes also present |
|---|
Location
| Latitude | 44.2764 |
|---|
| Longitude | -103.768 |
|---|
| State / province | South Dakota |
|---|
| Volcanic field | Black Hill Tertiary igneous province |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 47 |
|
40 |
55 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| AL2O3 | 18.9207 | | WT% | NAA |
| FE2O3 | 0.4151 | | WT% | NAA |
| MGO | 1.833 | | WT% | NAA |
| CAO | 0.5128 | | WT% | NAA |
| NA2O | 3.5494 | | WT% | NAA |
| TIO2 | 0.4031 | | WT% | NAA |
| MNO | 0.0449 | | WT% | NAA |
| BA | 562.16 | | PPM | NAA |
| CE | 38.3362 | | PPM | NAA |
| CO | 1.5653 | | PPM | NAA |
| CR | 4.879 | | PPM | NAA |
| CS | 3.5392 | | PPM | NAA |
| EU | 1.1697 | | PPM | NAA |
| HF | 3.7558 | | PPM | NAA |
| LA | 24.8454 | | PPM | NAA |
| LU | 0.1302 | | PPM | NAA |
| RB | 113.831 | | PPM | NAA |
| SB | 0.2998 | | PPM | NAA |
| SC | 0.887 | | PPM | NAA |
| SM | 4.377 | | PPM | NAA |
| TA | 1.9881 | | PPM | NAA |
| TH | 15.011 | | PPM | NAA |
| V | 11.4971 | | PPM | NAA |
| YB | 0.657 | | PPM | NAA |
